today the advisory center is tracking the plume but only in the area near japan. let's come back live i can show you now we're at .12 per hour, that's still .11 still low for our traditional background in this area. lower than it was in fact, an hour ago. so we expect no problems here and we searchers say there is absolutely no health risk. reporting live, john fowler. >>> federal officials said today they'll start testing some passengers arriving from japan for radiation. officials say they are starting to monitor people and cargo arriving on japanese flights. but in san francisco international airport passengers arriving from japan told us they were not tested for radiation. >> they had, because they didn't do anything. so, yeah, everything was totally normal. >> reporter: and sfo spokesperson told us an hour ago that u.s. customs officials reported no unusual radiation levels among airport arrivals today. officials say they have several ways to monitor radiation exposures that may not be apparent to travelers. >>> the first emergency charter flight has left jap